Down and Dirty Duck, promoted under the abbreviated title Dirty Duck, is a 1974 American adult animated comedy film written and directed by Charles Swenson and starring Mark Volman and Howard Kaylan (Flo & Eddie) as the voices of a strait-laced, low-level white-collar worker named Willard and an unnamed duck, among other characters. The plot consists of a series of often abstract sequences, including plot material created by stars Kaylan, Volman, Robert Ridgely, and, according to the film's ending credits, various people Swenson encountered during the making of the film.

Dirty Duck received mostly negative reviews, with many criticizing it for its crude humor and others seeing the film as an attempt to cash in on the success of Ralph Bakshi's Fritz the Cat. The film fared better on home video and is now considered a cult film